Grinding machine



Aug. 5, 1930. I c. G. FLYGARE 1,772,345

' GRINDING MACHINE Filed July 10. 1926 2 Sheets-Sheet 1 Carl 6; Zflygare Aug. 5, 1930. c. G. FLYGARE GRINDING MACHINE Filed July 10, 1926 2 Sheets-Sheet 2 I l l l l I II "Hill? M t W M w Patented Aug. :5, 1930 {UNI-TED ysra rss raram oFFIcE cm a. antenna, or woncnsrnn,

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I OF WORCESTER, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS cnmnme nacnmn Application filed July 10,

' This invention relates to grinding ma.- vchines, and morerparticularly to devices for.

on grinding machines for accurately truing or shaping the active surface of the abra-' sive wheel to the form desired.

In agrinding machine, such-as a cylindrical grinder, it. is frequently necessary to reshapeor resurface the grinding wheel in order to obtain an accurate. and satisfactory surface upon the work being ground. ,In some types of. grinding machines, especially those constructed and arranged for grinding relatively short work pieces, the truing device isarranged to be mounted between the head and tail stocks. vWhen it is desired to true the wheel in such machines it is necessary to set up the truing device accurately in a position for truin'g and this requires'considerable time and often necessitates the removal of tlie bead and tailstocks from their working positions and consequently their readjustment after truing.

It is an object of the present invention to provide a grinding machine with a truing device which is so constructed and\ arranged as to be accurately positioned for the truing operation at all times and which is adapted to shape the surface of the wheel to the form desired, such as to a tapered, cylindrical or anv irregular shape;

Further objects of thev invention are to mount the truing device above the grmdmg wheel to prevent the accumulation of water and grit thereon and to so arrange the parts that the truing tool carrier will be guided by and supported on a tiltable forming bar as it traverses across the wheel face. y

In accordance with the invention a grinding machine is provided with a trumg device arranged so that'the' dresser, such as a diamond point, positioned thereupon is adapted to be. moved towards the abrasive wheel, preferably, in a plane passing through I the axis of the wheel. One suitable construction for this purpose may comprise a trump;

mechanismsecurednn any appropriate mannerupon the machine and preferably mountn the guard for the abrasive wheel ed u whic is immovable relative to the axis thereof; Suitable means may be employed 1926. Serial No. 121,s1a.

for guiding the movement of the dresser upw on the periphery of the wheel. For this purpose a forming bar of desired configuration is mounted in the frame of thetruing mechatherewith and adapted to be moved relative thereto to cause the dresser to traverse the surface of the abrasive wheel in thedesired manner. The holder for the dresser, such as a diamond, is fixed to the follower and is arranged for movement in a substantially vertical" direction towards and away from the wheel so, that the follower is maintained in operative contact with the forming bar by the-influence of gravity. The holder is' mounted upon a slide which may be adjusted so as to permit movement of the diamond, preferably in a plane passing through the axis of the wheel.

The invention will be more clearly understood from the following description in conjunction with the accompanying drawings: inwhich,

Fig. 1 is a side 'elevational view of a POI?- tion of a grinding machine embodying the. Invention; Fig. 2 is a frontelevational view ofa trumg mechanism embodying the invention; I Fig. 3 isa sectional 'elevational view taken upon the line 3-3 of Fig. '2; and Fig. 4 is a detail view of the end of the slide of the truing mechanism illustrated.

In the drawings a portion of a cylindrical grinding machine is illustrated with a truing -mechanism constructed and arranged thereupon in accordance with the provisions of the invention. This machine is constructed similar to that described in the U. S. patent to Norton No. 1,443,924 and comprises a rear base 10 vprovided with suitable V and flat slideways 11 and 12 for carrying a slide 13 provided with similarly shaped slideways for engagement therewith. A grinding wheel 16 appropriately secured upon a spindle 17 suitably mountedin bearings 18 in the raised portion 19 on the slide. A Wheel guard 20 also is mountd upon the wheel slide and is rigidlyg secured thereto by means of bolts 21.

A truingmechanism support 22 is apprg;,l0fl

' priately secured upon the wheel uard 20 by secured in the wheel guard in any appromeans of bolts 23 passing theret rough and priate manner, such, for example, as by fitting inaflat sided hole 24 of T-s-haped cross section. A plate rests against the support 22 and is adapted to turn relative thereto about a pivot bolt 31, and .is held rigidly thereagainst in a desired position by means of bolts 32 secured to the plate 30and passing through arcuated slots 33 in the support 22. A scale 34 is provided on the end of the support 22 so that the angular position of the I plate 30 may be lndicated by an index point on the plate. 7

The plate 30 is provided with V and fiat slideways 40 and 41 respectively which are adapted to be engaged by similar slideways upon a slide 42 having a hollow cylindrical portion 43. A gib 44 is adjustably secured upon one of the slideways 40 on the sl1de 42 so it may be brought into engagement with .the corresponding'slideways of the plate 30 by means of a screw 45. A sleeve 46 is slidably mounted within the cylindrical portion 43 of the slide 42 and is provided at its upper end with an integral split ring 47 a'djustably held by a clamping screw 48. The inner surface of the sleeve 46 is shaped to slidably receive a shaft 49 which is secured to the sleeve 46 by a key 50. The upper end of the shaft 49 is threaded to receive a nut 51 to which a hand wheel 52 is secured by a key I 53. The hand wheel 52 is arranged to rest threaded upon the nut with a follower upon a collar 54 fitting between the ring 47 and the nut 51 and engaging a shoulder 55 upon the sleeve 46. Any displacement of the wheel 52 is prevented by a collar 56 51 and resting against the wheel 52. 7

' If desired a forming bar 57 may be mount= ed upon the plate 30 in operative association 58 held upon the sleeve 46 by bolts 59. Continuous contact between the follower 58 and the forming bar 57 is assured by the provision of a downwardly acting spring 60 secured at its upper end to a nut 61 upon the sleeve 46 by a screw 62. The lower end of the spring 60 is fastenedto a screw bolt. 63 passing through a screw eye 64 mounted in the cylindrical portion 43 of the slide 42, and held therein by' a nut 65 engaging the threaded portion of the bolt 63. A diamond 67, or other-suitable dresser, is mounted in the end of a screw 68 held in a threaded hole 69 in an inclined surface 70 and 41. With this in view,

onthe lower endof the shaft 49 and may be adjusted to any desired position relative to the shaft 49 by an adjusting nut 71 upon ghe screw 68 and engaging the inclined surace.

The diamond may be moved, across the periphery of the abrasive wheel 16 by causing the slide 42 to move along the slideways 40 a screw 75 is becomes worn the split guard is provided with '7 8 on either side of the stationary bearing to prevent axial movement, The threaded portion 79 of the screw 75 is adapted to engage a nut 80 integral with the slide 42. The other end of the screw 75 is provided with a worm gear 81 secured thereon by a key 82 and a nut 83 and engaging a worm cured upon a shaft 85 suitably, mounted for rotation in the plate 30. A hand wheel .86 having a handle 87 is suitably secured upon the end of the shaft 85 by a nut 88.

If it is desired to form a cylindrical surface on the abrasive wheel 16,'the clamping bolts 32 are loosened and the plate 30 turne about the shaft 31 until the slideways 4O and 41 are positioned so that the slide 42 may move along a path parallel to abrasive wheel. course. that when the plate 30 is positioned as desired the clamping bolts 32 are tightened. Similarly, if it is desired to taper the surface of the abrasive wheel, the slide 42 is brought to a position so that it may be moved in a path making an angle with the axis of the abrasive wheeL' If an irregular surface is desired upon the abrasive wheel, a forming bar 57 having an appropriate irregular guiding surface is employed, and in such case. as the follower 58 is moved along that surface the sleeve 46 and the shaft 49 would the axis of the It will be understood, of

be moved in accordance with the irregularities upon the forming bar and thus guide the diamond67 along a path such as to shape the surface efthe grinding wheel as desired.

It will be understood that the forming bar 57 and the follower 58 may be entirely dispensed with when the truing mechanism is employed for'shaping cylindrical wheels. In such case the forming bar is removed so as to permit the top portion of the sleeve 46 to rest against the slide. If the sleeve 46 lower section of the cylindrical portion 43 of the slide 42 may be adjusted relative thereto by the screws 89 to an extent such as to permit free movement of the sleeve relative to the slide.

In accordance with the preferred construcinasmuch as the proper relation between the wheel and truing mechanism is always maintained regardless of the wear upon the wheel, and it is not necessary todismantle or place .out of adjustment any of the parts of the machine. In order to assure proper protection to the operator the front of the wheel an adjustable portion. In the machine illustrated an extension 90 is pivotally, mounted to swing about the bolt 91 at the frontof the wheel guard 1.;

20 so as to be moved towards the periphery of the wheel and may be secu'red in any position relative thereto by a bolt 92 passing through an arcuated slot 93 in the wheel guard and engaging a threaded hole in the extension. v r Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

. 1. A grinding machine comprising a grinding wheel and a mounting therefor,-a truing mechanism secured upon the mounti g and including a movable slide having a ho low housing, a forming bar mounted in-fixed relation to the axis of the Wheel, a sleeve freely slidable within said housing slide to move relative thereto towards the wheel and carrying a follower arranged for operative association with the forming bar, a dresser mounted within the sleeve, a precision feed mechanismfor feeding the dresser relative to the sleeve, and means for actuating the slide to move the dresser across the periphery of the wheel.

2. A truing mechanism for a grinding wheel comprising a support tiltable'in a radial'plane of the wheel located adjacent to the wheel, a transversely movable carrier thereon, a diamond carried thereby and free ly mounted to move towards and from the wheel, a forming barand follower interposed between the diamond and the support which are arranged to determine the path of travel of the diamond and means for adjustably tilting the support so as to permit forming a tapered wheel face.

3. A truing mechanism for a grinding wheel comprising a support tiltable in a radial plane of the wheel located adiacent to the wheel, a transversely movable slide thereon, a diamond carried bv the slide and freely mounted to move vertically towards and from the wheel. a forming bar and follower interposed between the diamond and the support which are arranged to support the diamond and determine the path of travel of the diamond, means for adiustably tilting the support so as to permit forming a tapered wheel face and a nut and screw mechanism for traversing the slide.

4'. A grinding machine comprising a grinding wheel and a mounting therefor, mechanism secured upon the mounting and including a pivotally mounted support, a slide on said support, aformingbar mounted on the support, a diamond, a carrier for the diamond supported on the slide and mov able towards and from the wheel, a follower on said carrier arranged for operative association with the forming bar, manual. means for actuating'the slide to move the diamond across the periphery of the wheel, and readily accessible means to'tilt said support so as to produce a tapered faced wheel. 5. A truing apparatus for a grinding wheel comprising a support adjustable ina a forming bar fixed to vary the path ofto produce either a Massachusetts, this a truing j 

